The present invention discloses an image denoising method. For an image with a pulse noise and a Gaussian noise, through detecting and separating a pulse noise point, a pixel which is polluted by the pulse noise is subjected to median filter processing in a spatial domain, then a processed image is converted into a wavelet domain, and a wavelet denoising method is employed to remove the Gaussian noise in the image. By using the method, the pulse noise and the Gaussian noise in the image can be effectively removed, the authenticity of image transmission is ensured, the signal to noise ratio is raised, and the desired characteristic of the image is highlighted.